Steam-boiler.



PATENTED AUG. 4, 1903.

J. I. THORNYOROPT.

STEAM BOILER.

APPLICATION FILED MAY 12, 1899.

N0 MODEL.

W w Q 1 Ma M? m: Nonms PETERS COfFNOTO-LITHOY, WASHINGTON. o. c.

1 UNITED STATES Patented August 4,1903

PATENT OFFICE.

STEAM-BOILER.

SPEGIFIGATIQNforming part of Letters P atent No. 735,427, dated August4, 1903.

Application filed May 12, 1899. Serial No. 716,484. (No model.)

To all whom it may concern:

Be it known that 1, JOHN ISAAC THORNY- CROFT, a subject of the Queen ofGreat Britain and Ireland, residing at Church Wharf, Ohiswick, in thecounty of Middlesex, England, have invented Improvements in Steam-Boilers, of which the following is a specification. 1 i r According tothisinvention in a water-tube steam-boiler of the so-called. Daring type(see Thornycrofts patent, No. 452,401) there are provided externally ofthe casing downflow-tubes which connect the upper steam and watervessel-with the outer lower water vessels. Also thesmallersteam-generating tubes which connect each of the outer lowervessels with the upper vessel are so disposed that some of them form twoflues, in which the other tubes are located, and the products ofcombustion from each'fire-box pass partly' into the lower part of aninner flue formed by tubes and partly intothe lower part of thecorresponding outer fiue formed by tubes.

The products of combustion risingwithin each inner flue and thecorresponding outerflue' unite in the upper part of the outer flue andflow thence through channels formed by and between suitable walls orcasings tothe chimney, the arrangement being such as to. pro

tect that part of the wall of the upper vessel.

which is above the water-levelfrom the d i rect action of the productsof combustion.

For the purpose of enabling my invention onjthe line as w of Fig.2looking toward the.

front end of the boiler, and Fig. 2shows'a side elevation of the boiler.l p

The boiler here represented by way of example comprises an upper steamand water nal downflow-tubes 6, arranged at intervals (in one or morerows) in the length of the boiler, while external downflow tubes 7',which are arranged at the front end only of the boiler, connect thelower part of the upper vessel to the upper parts of the lower vessels 22 The smaller of the bent tubesviz., 4--which connect the central lowervessel 2 and the upper vessel 1, enter the latter at opposite sides ofthe longitudinal center of the boiler. These tubes are arranged in rows,whereof the two inner rows L -4'. e., those nearest to the verticalplane of the longitudinalcenter of the boilerand the two outer rows 4z'. e., those next to the fire-box 3-are bent to form (excepting as totheir ends) tube-walls which constitute flues 8, wherein theinterveuingtubes 4 are arranged in rows. The two inner walls formed by the rows oftubes 4 serve to protect from the direct action'of the products ofcombustion the before mentioned down flow-tubes 6, whereby the upperandcentral lower vessels 1 and 2 are connected, and which tubes arelocated within a central chamber 8, formed between the two innertube-walls. .Each of the outer lower vessels2 2 -is connected with theupper vessell also by several rowsof tubes, whereofthe two outer rows 5and the two inner rowstBare made to form (excepting as to the ends ofthe tubes) walls of a flue 9, within which the remaining tubes 5 arearranged in rows.

The outer wall of each inner flue 8 and the inner wall of each outerflue 9 meet at a suitable distance above the fire-grate, as at 10.

The lower portions of the tubes constituting these respective walls areso arranged as to provide-spaces 11 between the wall-tubes, wherebyproducts of combustion can enter the respective fines 8 and 9, up whichthey flow. The upper portions of the tubes of both walls of each outerflue 9 and those of the outer wall of each inner flue 8 are arranged toafiord spaces 12 between those portions of the said tubes for the upwardflow of the products of combustion in directions at tions of the tubes.The arrangement is such ICO that the hot gases which have ascendedwithin'the inner flues 8 join, in the upper. portions of the outer flues9, the hot gases that have ascended within the said fines 9. From thislocality the gases pass away to the chimney 13 through suitable channels14, formed by and between walls or casings and 15*. The inner of thesewalls or casingsviz., 15 is arranged at some distance from the outersurface of the top portion of the upper vessel- 1, so as to protect thatpart of the said vessel from the direct action of the products ofcombustion.

16 is the ordinary boiler-casing.

Within the upper vessel 1 there are or may be plates 1 for deflectingwater and steam, also plates 1 for deflecting water and steam from thedownflow-tubes 6, and an arrangement for separating from the steam waterthat has been carried up with the steam. The steam-separatingarrangement can be of various kinds, but may advantageously consist ofinner and outer longitudinal pipes 17 and 18, arranged concentricallyone within the other, so as to leave between them. an annular space orchamber 19, that is in communication with the interior of the vessel 1through slits or openings at 20 in the outer pipe 18 and with the steam-main through slits or openings at 2L in the inner pipe 17, alongitudinal partition 22 separating the two sets of slits or openings20 and 21, and one or more openings being also provided in the outerpipe 18 at 23 for conducting water that has become separated from thesteam in the space or chamber 19 into a casing or box 24, whence it canflow by a pipe 25, having a non-return valve, into the water-space ofthe vessel 1, as more fully described in Letters Patent No. 657,968,granted to me'September 18, 1900.

What I claim is 1. A water-tube steam-boiler comprising an upper vesselfor water and steam, three lower vessels for water, external downfiowwatertubes connecting the front portion of the uppervessel to the frontportion of each of the two outer lower vessels, downflow-tubes arrangedalong the boiler from the upper vessel to the central lower vessel, andsmaller tubes connecting the upper vessel to each of the lower vessels.

2. Awater-tubesteam-boilercomprisingan upper vessel for steam and water,three lower vessels for water,.external down flow-tubes located at thefront end of the boiler whereby said upper vessel is directly andseparately connected to each of the two outer lower water vessels,internal downtake-tubes connecting the upper vesselto the lower centralvessel, two'inner sets or bundles of small tubes arranged to connectopposite sides of the upper vessel to the lower central vessel, and twoouter sets or bundles of tubes arranged to connect opposite sides ofsaid upper vessel to the two outer lower vessels, substantially asdescribed.

. 3. A water-tube steam-boi ler comprising an upper vessel for steam andWater, three lower Vessels for water, external downflow-tubes 10- catedat the front end of the boiler whereby said upper vessel is directly andseparately connected to each of the two outer. lower water vessels, twoinne'r sets orbundles of small tubes arranged to connect opposite sidesof the upper vessel to the lower central vessel and to form a centralchamber between them, two outer sets or bundles of small tubes arrangedto connect opposite sides of said upper vessel to the two outer lowerwater vessels, and downtake-t-ubes arranged along the boiler from theupper vessel to the central lower vessel and located within said centralchamber, substantially as described.

4. A water-tube steam-boiler comprising an upper vessel for steam andwater, three lower vessels for water, external downfiow-tubes located atthe front end of the boiler whereby said upper vessel is directly andseparately connected to each of the two outer lower water vessels,internal downtake-tubes connecting the upper vessel to the lower centralvessel, two inner sets or bundles of small tubes arranged to connectopposite sides of the upper vessel to the lower central vessel, twoouter sets or bundles of small tubes arranged to connect opposite sidesof said upper vessel to thetwo outer lower water vessels, and an uptakelocated above the upper vessel and the upper ends of said tubes, spacesbeing left between the upper ends of said small tube whereby hot gasescan pass upward direct to said uptake, substantially as described.

5. A water-tube steam-boiler comprising an upper vessel for water andsteam, three lower vessels for water, external downtlow watertubesconnecting the front portion of the upper vessel to the front portion ofeach of the two outer lower vessels, downflow-tubes arranged along theboiler from the upper vessel to the central lower vessel, two sets orbundles of small tubes connecting the central lower vessel with the twosides of the upper vessel, some of the tubes of each set formingtube-walls whereby two flues are constructed one at each side of thecentral longitudinal vertical plane of the boiler and an intermediatecentral chamber in which are located the said internal down flow-tubes,and a set or bundle of tubes between each outer lower water vessel andthe corresponding side of the upper vessel, some of the tubes of eachset or bundle constituting tube-walls which form at each side of theboiler an outer flue containing some of the tubes of the set or bundle,substantially as described.

6. Awater-tube steam-boiler comprisingan upper vessel for water andsteam, three lower vessels for water, external downflow watertubesconnecting the front portion of the upper vessel to the front portion ofeach of the two outer lower vessels, downflow-tubes arranged along theboiler from the upper vessel to the central lower vessel, two inner setsor bundles of small tubes connecting the central lower vessel with thetwo sides of the up per vessels, two outer sets or bundles of smallbetween the lower ends of the tubes of said walls and also betweentheupper ends of the tubes constituting both walls of each outer flue,and between those constituting the outer wall of each inner flue,substantially as described for the purposes specified.

- 7. A water-tube steam-boiler comprising an upper vessel for water andsteam, three lower vessels for water, external downflow watertubesconnecting the front portion of the upper vessel to the front portion ofeach of the two outer lower vessels, one or more downflow water-tubesbetween said upper vessel and the lower central vessel, two inner setsor bundles of small tubes connecting the central lower vessel with thetwo sides of the upper vessels, two outer sets or bundles of small tubesconnecting the outer lower water vessels to the two sides of the uppervessel, some of the tubes of each set or bundle constituting inner andouter tube-walls of a flue containing other tubes of the set or bundle,and fire-boxes one at each side of the longitudinal center of theboiler, said fireboxes being formed each by and between the inner wallof the outer flueand the outer wall of the inner flue, which walls meetto form the top of the fire-box, and openings being formed between thelower ends of the tubes of said walls and also between the upper ends ofthe tubes constituting both walls of each outer flue, and between thoseconstituting the outer wall of each inner flue.

8. Awater-tube steam-boilercomprisingan upper vessel for steam andwater, three lower vessels for water, fire-grates between said lowervessels, separate external downflow wa ter-tubes connecting the frontportion of the upper vessel to the front portion of each of the twoouter lower vessels, two inner sets or bundles of small tubes connectingthe upper vessel to the lower central vessel and two inner sets orbundles of small tubes connecting the upper vessel to the two outerlower vessels, some of the tubes of each set or bundle being arranged toform a flue in which other tubes of the set or bundle are arranged andwhich is provided with inlets at the bottom and outlets at the top andthe four sets or bundles being arranged to form the sides and top of twofire-boxes above said grates and a central chamber, downtake-tubesarranged along the boiler from the upper vessel to the lower centralvessel and located within said central chamber, and an uptake locatedabove the upper vessel and the outlet from the pairs of flues at eachside of the central longitudinal vertical plane of the boiler,substantially as described.

9. In a water-tube steam-generator,the combination with an upper vesselfor steam and water and steam-generating tubes connected thereto, of anuptake located over said vessel and the upper ends of said tubes, and ashield located above the top of said vessel and mainly at a distancetherefrom and within said uptake, substantially as described for thepurpose specified.

10. In a water-tube steam generator, the combination with an uppervessel for steam and water, and steam-generating tubes connected to saidupper vessel at each side of the central longitudinal plane of theboiler, of an uptake located over said upper vessel and the upper endsof said tubes, and a shield or deflector arranged above and mainly atsome distance from the upper portion of said vessel and so as to formwith the sides of the uptake guiding-passages for products of combustionescaping upward from between said tubes, substantially as described.

11. In a water-tube steam-boiler, the combination with an upper vesselfor steam. and water, lower water vessels, downflow-tubes connectingsaid upper and lower vessels, uptake-tubes connected to the lowervessels and to the two sides of said upper vessel and arhot gasesescaping from the flues can pass to' said chimney without coming indirect contact with the top of said upper vessel, substantially asdescribed.

Signed at 77 Oornhill, in the city of London,

England, this 21st day of April, 1899.

JOHN ISAAC THORNYOROFT.- Witnesses:

WM. 0. BROWN, HUGH HUGHES.

